Established as a part of the flora in an area other than the place of origin.

Neutral soil

Soil that is neither acid nor alkaline, having a pH value of 7.

Nitrogen

Major plant nutrient especially important for plants where foliage is the main interest.

Node

The place on the stem where leaves or branches are attached.

NPK

Acronym for the three major plant nutrients contained in manure, compost and
fertilizers, and used to describe the amounts of each readily available. N is for
nitrogen, P for phosphorus, and K for potassium

Nutrient

Any substance, especially in the soil, which is essential for, and promotes growth of
plants. Generally applied to a group of a dozen or less common elements, especially
nitrogen, phosphorus and potassium.

Nutrient deficiency

An inferior state of health in any plant brought about by insufficient amount of a given
nutrient being present or available to the plant.